--------restart snmp trap service--------
/etc/init.d/snmptrapd restart
--------check trap in syslog--------
tail -f /var/log/syslog
----mibs----
/usr/share/snmp/mibs
--------snmp status--------
service snmpd status
--------ubuntu ping6 link local--------
ping6 fe80::6d0c:7330:1f06:9cb5 -I enp7s
--------check port number--------
netstat -lun \|grep 161